Implement a frame tuple accessor class for results which contains just a single serialized string of records without any fields.
git-svn-id: https://hyracks.googlecode.com/svn/branches/fullstack_hyracks_result_distribution@3056 123451ca-8445-de46-9d55-352943316053
diff --git a/hyracks/hyracks-dataflow-common/src/main/java/edu/uci/ics/hyracks/dataflow/common/comm/io/ResultFrameTupleAccessor.java b/hyracks/hyracks-dataflow-common/src/main/java/edu/uci/ics/hyracks/dataflow/common/comm/io/ResultFrameTupleAccessor.java
new file mode 100644
index 0000000..915a436
--- /dev/null
+++ b/hyracks/hyracks-dataflow-common/src/main/java/edu/uci/ics/hyracks/dataflow/common/comm/io/ResultFrameTupleAccessor.java
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2009-2010 by The Regents of the University of California
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * you may obtain a copy of the License from
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package edu.uci.ics.hyracks.dataflow.common.comm.io;
+
+import java.io.DataInputStream;
+import java.nio.ByteBuffer;
+
+import edu.uci.ics.hyracks.api.comm.FrameHelper;
+import edu.uci.ics.hyracks.api.comm.IFrameTupleAccessor;
+import edu.uci.ics.hyracks.dataflow.common.comm.util.ByteBufferInputStream;
+
+public class ResultFrameTupleAccessor implements IFrameTupleAccessor {
+
+ private final int frameSize;
+ private ByteBuffer buffer;
+
+ public ResultFrameTupleAccessor(int frameSize) {
+ this.frameSize = frameSize;
+ }
+
+ @Override
+ public void reset(ByteBuffer buffer) {
+ this.buffer = buffer;
+ }
+
+ @Override
+ public ByteBuffer getBuffer() {
+ return buffer;
+ }
+
+ @Override
+ public int getTupleCount() {
+ return buffer.getInt(FrameHelper.getTupleCountOffset(frameSize));
+ }
+
+ @Override
+ public int getTupleStartOffset(int tupleIndex) {
+ return tupleIndex == 0 ? 0 : buffer.getInt(FrameHelper.getTupleCountOffset(frameSize) - 4 * tupleIndex);
+ }
+
+ @Override
+ public int getTupleEndOffset(int tupleIndex) {
+ return buffer.getInt(FrameHelper.getTupleCountOffset(frameSize) - 4 * (tupleIndex + 1));
+ }
+
+ @Override
+ public int getFieldStartOffset(int tupleIndex, int fIdx) {
+ return fIdx == 0 ? 0 : buffer.getInt(getTupleStartOffset(tupleIndex) + (fIdx - 1) * 4);
+ }
+
+ @Override
+ public int getFieldEndOffset(int tupleIndex, int fIdx) {
+ return buffer.getInt(getTupleStartOffset(tupleIndex) + fIdx * 4);
+ }
+
+ @Override
+ public int getFieldLength(int tupleIndex, int fIdx) {
+ return getFieldEndOffset(tupleIndex, fIdx) - getFieldStartOffset(tupleIndex, fIdx);
+ }
+
+ @Override
+ public int getFieldSlotsLength() {
+ return getFieldCount() * 4;
+ }
+
+ public void prettyPrint() {
+ ByteBufferInputStream bbis = new ByteBufferInputStream();
+ DataInputStream dis = new DataInputStream(bbis);
+ int tc = getTupleCount();
+ System.err.println("TC: " + tc);
+ for (int i = 0; i < tc; ++i) {
+ System.err.print(i + ":(" + getTupleStartOffset(i) + ", " + getTupleEndOffset(i) + ")[");
+
+ bbis.setByteBuffer(buffer, getTupleStartOffset(i));
+ System.err.print(dis);
+
+ System.err.println("]");
+ }
+ }
+
+ @Override
+ public int getFieldCount() {
+ return 1;
+ }
+}